Segment3dSegment3dIntersectXY 这个函数怎么用？后面四个参数是什么意思？

Question

老师请问Segment3dSegment3dIntersectXY 这个函数怎么用？后面四个参数是什么意思？帮助文档里说的不清楚。多谢了！

Yongan.Fu · Accepted Answer

xiaolan zhou said: 两条线段上的交点，仅仅是Z坐标可能不一样吧？X Y坐标都是一样的吧？ 
 实际测试是这样的。该函数返回从TopView看过去的交点。两端线没有终点，会自动延长求交的。除非两段线平行才没有交点。 
 你可以找到MicroStationVBA.chm帮助文档，仔细看每个函数的详细说明。

xiaolan zhou · Answer

我用下面的代码获取到的交点都是0 
 Segment3d seg1 = new Segment3d(); seg1.StartPoint = sourcePointA; seg1.EndPoint = sourcePointB; 
 Segment3d seg2 = new Segment3d(); seg2.StartPoint = pointB ; seg2.EndPoint = pointA; app.Segment3dSegment3dIntersectXY(seg1, seg2, ptTemp1, f1, ptTemp2, f2); ptCross = ptTemp1;

Yongan.Fu · Answer

请参考如下代码： 
 private static void SegSegIntersectXYTest()
 {
 BIM.Application app = BMI.Utilities.ComApp;
 BIM.LineElement line1 = app.ActiveModelReference.GetElementByID64(2927) as BIM.LineElement;
 BIM.LineElement line2 = app.ActiveModelReference.GetElementByID64(2928) as BIM.LineElement;
 BIM.Segment3d seg1 = new BIM.Segment3d();
 seg1.StartPoint = line1.StartPoint;
 seg1.EndPoint = line1.EndPoint;
 BIM.Segment3d seg2 = new BIM.Segment3d();
 seg2.StartPoint = line2.StartPoint;
 seg2.EndPoint = line2.EndPoint;

 double f1=-1, f2=-1;
 BIM.Point3d pt1 = new BIM.Point3d(), pt2 = new BIM.Point3d();
 app.Segment3dSegment3dIntersectXY(ref seg1, ref seg2, ref pt1, ref f1, ref pt2, ref f2);
 MessageCenter.Instance.ShowInfoMessage("pt1=" + pt1.X.ToString() + ", " + pt1.Y.ToString(), null, true);
 } 
 测试结果正确：

Segment3dSegment3dIntersectXY 这个函数怎么用？后面四个参数是什么意思？

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